Block refresh?

[mcfrank]

We worry that children are potentially refreshing, creating duplicated runs.

There might be some issue with ipad-style down drag to refresh (we can get this to happen on iphone for example).

To see this in data, you can go to pilot-co-uniandes-bogota and the runs table:

SELECT * FROM _source_
ORDER BY task_id DESC, user_id DESC
LIMIT 10000

This will give a number of repeated runs.